Table 1.

Composite set shifting switching cost and mixing cost scores of the training tasks.

			Training (n = 17)		Control (n = 16)a
		Session	Mean	SD	Mean	SD	Sig.
Reaction times (ms)	Switching cost	Pretest	320.90	119.58	276.11	106.47	N/A
		Posttest	174.46	60.99	287.27	110.99	*
		Follow-up	271.60	112.75	287.80	131.31	ns
	Mixing cost	Pretest	400.63	52.51	366.63	72.19	N/A
		Posttest	159.69	53.03	310.81	85.00	*
		Follow-up	216.30	81.78	305.33	99.15	*
Correct responses (%)	Switching cost	Pretest	−3.94	3.72	−2.36	3.21	N/A
		Postest	−0.69	0.90	−2.15	2.34	ns
		Follow-up	−0.62	1.88	−2.08	2.43	*
	Mixing cost	Pretest	−2.33	2.84	−1.50	3.77	N/A
		Posttest	−0.25	1.20	−0.88	1.34	ns
		Follow-up	−0.39	1.17	−1.16	2.43	ns

Between-group differences at posttest and follow-up were analyzed with ANCOVA.

^aOne participant in the control group declined to participate in the follow-up, leading to a sample size of 15 at that measurement point.

^*Alpha level is Bonferroni corrected (p = 0.0038 at posttest), ns = not significant.